CONTENTS. XV11 



CHAPTER XXI. 



SECRETIONS. 



PAGE 



Lachrymal Glands, 374 



Mucous Glands, 375 



Sebaceous Glands, 377 



Mammary Glands, 378 



Composition of Milk, 380 



Sudoriferous Glands, . . 383 



Cutaneous Desquamation, 385 



CHAPTER XXII. 



URINARY EXCRETION. 



Structure of the Kidneys, .388 



Bloodvessels of the Kidneys, 389 



Urine, 391 



Method of Secretion of the Urine, 393 



Chemical Composition of the Urine, 397 



Urea, 398 



Uric Acid, 399 



Kreatinin, Xanthin, Hippuric Acid, etc., ...... 400 



Coloring Matters and Inorganic Salts, 401 



Abnormal Constituents, 403 



Urinary Calculi, 404 



Source of Urea, etc., 405 



Nervous Mechanism of the Urinary Secretion, 407 



Outflow of Urine, 408 



Nervous Mechanism of Micturition, 411 



CHAPTER XXIII. 



NUTRITION.- 



Tissue Changes during Starvation, 414 



Food Requirements, 417 



Ultimate Uses of Food-stufls, 423 



CHAPTER XXIV. 



ANIMAL HEAT. 



Warm- and Cold-blooded Animals, 



Variations in the Body Temperature, 



